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There is no pressure threshold; typically it is referred to as a cyclone when there is a closed area of low pressure (as opposed to just a "wave").

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Q: At what synoptic pressure is a cyclone declared?
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What is synoptic-scale system?

It is a weather system in meteorology on the scale of a cyclone or anticyclone.


What is synoptic scale system?

It is a weather system in meteorology on the scale of a cyclone or anticyclone.


What kind of pressure does a cyclone have?

A cyclone has low pressure.


What kind of air pressure does a cyclone have?

A cyclone has low pressure.


Does a cyclone have high pressure?

No. A cyclone is a low pressure system.


What is extropical cyclones?

An extratropical cyclone is a synoptic scale low pressure system that is neither tropical nor polar. They often bring rain and thunderstorms. See the link below for more information.


What is the opposite of cyclone?

The opposite of a cyclone is an anticyclone. A cyclone is a low-pressure system with inward spiraling winds, while an anticyclone is a high-pressure system with outward spiraling winds.


What is a swirling center of air pressure called?

cyclone.


What is the pressure in a middle-latitude cyclone?

Low pressure.


Where does the force of a cyclone come from?

Cyclone is caused due to the variation of atmospheric pressure in the air. Especially in the low atmospheric zone, air comes from all sides to balance the atmospheric pressure in that area. That's why cyclone is created. So the force for cyclone comes from variation in atmospheric pressure.


What is the air pressure inside a cyclone?

the air in the cyclone rises as the air rises it cools


What is an area of lower pressure winds that spiral toward the center called?

air pressure!